Version 0.22 of pyelftools was released today (on PyPI too). Some nice new features in this release - most notably initial support for DWARF v4, as well as better support for ARM objects (including 64-bit ARM).
By the way, I recently noticed that pyelftools appears in the open source credits page of Chrome (chrome://credits). I knew the Chrome and Chrome OS teams are using it for some of their tools & testing, but hadn't bothered to check the credits page until recently. This is probably the most high-profile (at least publicly visible) user of pyelftools.